US5884455A - Product wrapping method - Google Patents
Product wrapping method Download PDFInfo
- Publication number
- US5884455A US5884455A US08/816,638 US81663897A US5884455A US 5884455 A US5884455 A US 5884455A US 81663897 A US81663897 A US 81663897A US 5884455 A US5884455 A US 5884455A
- Authority
- US
- United States
- Prior art keywords
- sheet
- product
- charges
- electric field
- plates
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000005684 electric field Effects 0.000 claims abstract description 17
- 239000003989 dielectric material Substances 0.000 claims abstract description 10
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 8
- 238000009826 distribution Methods 0.000 claims description 12
- 239000003990 capacitor Substances 0.000 claims description 6
- 239000004020 conductor Substances 0.000 claims description 6
- 238000000151 deposition Methods 0.000 claims description 2
- 230000006698 induction Effects 0.000 claims description 2
- 235000019504 cigarettes Nutrition 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 2
- 239000012777 electrically insulating material Substances 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 230000005611 electricity Effects 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B61/00—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages
Definitions
- the present invention relates to a product wrapping method.
- the present invention relates to a method of overwrapping, by means of a sheet of dielectric material, a product made at least externally of dielectric material, e.g. a product having an outer wrapping made of dielectric material.
- the present invention is particularly advantageous for use on overwrapping machines, in particular machines for cellophaning packets or cartons of cigarettes, to which the following description refers purely by way of example.
- a sheet of transparent synthetic material normally a sheet of polypropylene, is folded into a U about each product, comprising a carton or packet of cigarettes, so that two opposite portions of the sheet project beyond the product; which portions are subsequently folded one on top of the other on the product to form a tubular wrapping, which is completed by stably connecting the two portions to each other.
- a major problem when designing cellophaning machines of the above type is ensuring each U-folded sheet adheres perfectly to the product for as long as it takes to fold and connect the projecting portions, and without damaging either the sheet or the product.
- a method of wrapping a product made at least externally of dielectric material comprising the step of folding a sheet of dielectric wrapping material into a U about said product, and being characterized by comprising a stabilizing step for stabilizing the sheet in the U-folded position; said stabilizing step being performed by generating an electrostatic force of attraction between the sheet and an outer surface of the product.
- Said force is preferably generated by forming a first given distribution of electric charges on said sheet, and a second distribution of charges of opposite sign on the outer surface of the product.
- said distributions of electric charges are formed by induction, by placing the product and the sheet inside an electric field; said first distribution of charges being formed on an inner surface of the sheet.
- said distributions of electric charges are formed by depositing charges on said sheet; said first distribution of charges preferably being formed on an outer surface of said sheet.
- FIGS. 1, 1A, 1B shows a schematic side view, with parts in section and parts removed for clarity, of an overwrapping machine implementing the method according to the present invention;
- FIGS. 1A and 1B are enlarged details in FIG. 1;
- FIG. 2 shows a schematic side view, with parts in section and parts removed for clarity, of a variation of the FIG. 1 machine.
- Number 1 in FIG. 1 indicates an overwrapping machine, in particular a cellophaning machine, for overwrapping products 2 comprising, in the example shown, packets or cartons of cigarettes, each having an outer wrapping 3 made of dielectric material.
- Machine 1 comprises a folding device 4 for folding a sheet 5 of dielectric wrapping material (normally polypropylene) into a U about each product 2, and which in turn comprises a passage or channel 6 having a longitudinal axis 6a and an inlet opening 7 lying in a plane perpendicular to axis 6a. Opening 7 is defined laterally, by way of example, by two rollers 8 made of dielectric material and mounted for rotation about respective axes 9 parallel to each other and crosswise to axis 6a.
- dielectric wrapping material normally polypropylene
- Machine 1 also comprises a known product supply device 10 for successively feeding products 2 through opening 7 of channel 6 in a direction 11 parallel to axis 6a; and a known supply line 12 for successively feeding sheets 5 of wrapping material in a direction 13 perpendicular to direction 11 and crosswise to axes 9, and for arresting each sheet 5 at opening 7.
- a known product supply device 10 for successively feeding products 2 through opening 7 of channel 6 in a direction 11 parallel to axis 6a
- a known supply line 12 for successively feeding sheets 5 of wrapping material in a direction 13 perpendicular to direction 11 and crosswise to axes 9, and for arresting each sheet 5 at opening 7.
- Machine 1 also comprises a stabilizing device 14, in turn comprising an electric generator 15, and two electrically conductive plates 16 and 17 extending parallel to each other and to axes 9 and direction 11, and located on either side of axis 6a, adjacent to rollers 8, so as to define two opposite lateral walls of channel 6. Plates 16 and 17 are connected respectively to a positive and a negative pole of generator 15 to define the opposite plates of a capacitor 18 for generating an electric field through channel 6.
- a sheet 5 and a respective product 2 are fed in time with each other up to opening 7 by line 12 and device 10 respectively.
- one end of product 2 contacts sheet 5, which, together with product 2, is inserted through opening 7 into channel 6 and, in contact with the periphery of rollers 8, is gradually folded into a U about product 2.
- Rollers 8 may be powered to rotate in opposite directions, and so that each roller 8 rotates, in contact with a respective portion of sheet 5, in the opposite direction to direction 11.
- charges 26 and 30 provide for substantially vacuum connecting sheet 5 to product 2, for stabilizing sheet 5 in the U-folded position about product 2, and for ensuring sheet 5 adheres perfectly to product 2 for a certain length of time and in the absence of an electric field, with no need for any type of external retaining element.
- the outer surface 31 of plate 16 facing plate 17 comprises a number of seats 32, each having a lining 33 of electrically insulating material, and each housing a respective pad 34 made of electrically conducting material and with its outer surface coplanar with surface 31.
- Plate 16 and pads 34 are respectively connected to the negative pole of a respective generator 15 and to the positive pole of generator 15, and define a first capacitor 35 for generating an electric field close to surface 31 of plate 16.
- the outer surface 36 of plate 17 facing plate 16 comprises a number of seats 37, each having a lining 38 of electrically insulating material, and each housing a respective pad 39 made of electrically conducting material and with its outer surface coplanar with surface 36.
- Plate 17 and pads 39 are respectively connected to the negative pole of a respective generator 15 and to the positive pole of generator 15, and define a second capacitor 40 for generating an electric field close to surface 36 of plate 17.
- plates 16 and 17 are dispensed with, and the poles of generator 15 are connected to rollers 8, which, in this case, are made of electrically conducting material.
- plates 16 and 17 and generator 15 are dispensed with, and rollers 8 are drive rollers made at least externally of a material for generating electric charges 22 on sheet 5 by triboelectrification or frictional electricity.
- said electric field is a local electric field generated by charges 22, and which induces, on surface 29 of product 2, charges 30 opposite in sign to charges 22.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Wrapping Of Specific Fragile Articles (AREA)
- Basic Packing Technique (AREA)
Abstract
A method of overwrapping a product having an outer wrapping of dielectric material; the method providing for feeding a sheet of dielectric overwrapping material past an opening of a passage for the product; feeding the product into engagement with the sheet and subsequently, together with the sheet, through the passage to fold the sheet into a U about the product; and stabilizing the sheet so folded by feeding the sheet and the product through an electric field.
Description
The present invention relates to a product wrapping method.
More specifically, the present invention relates to a method of overwrapping, by means of a sheet of dielectric material, a product made at least externally of dielectric material, e.g. a product having an outer wrapping made of dielectric material.
The present invention is particularly advantageous for use on overwrapping machines, in particular machines for cellophaning packets or cartons of cigarettes, to which the following description refers purely by way of example.
On cellophaning machines of the above type, a sheet of transparent synthetic material, normally a sheet of polypropylene, is folded into a U about each product, comprising a carton or packet of cigarettes, so that two opposite portions of the sheet project beyond the product; which portions are subsequently folded one on top of the other on the product to form a tubular wrapping, which is completed by stably connecting the two portions to each other.
A major problem when designing cellophaning machines of the above type is ensuring each U-folded sheet adheres perfectly to the product for as long as it takes to fold and connect the projecting portions, and without damaging either the sheet or the product.
It is an object of the present invention to provide a method designed to eliminate the above problem.
According to the present invention, there is provided a method of wrapping a product made at least externally of dielectric material, the method comprising the step of folding a sheet of dielectric wrapping material into a U about said product, and being characterized by comprising a stabilizing step for stabilizing the sheet in the U-folded position; said stabilizing step being performed by generating an electrostatic force of attraction between the sheet and an outer surface of the product.
Said force is preferably generated by forming a first given distribution of electric charges on said sheet, and a second distribution of charges of opposite sign on the outer surface of the product.
According to a preferred embodiment of the above method, said distributions of electric charges are formed by induction, by placing the product and the sheet inside an electric field; said first distribution of charges being formed on an inner surface of the sheet.
According to a further preferred embodiment of the above method, said distributions of electric charges are formed by depositing charges on said sheet; said first distribution of charges preferably being formed on an outer surface of said sheet.
A non-limiting embodiment of the present invention will be described by way of example with reference to the accompanying drawings, in which:
FIGS. 1, 1A, 1B shows a schematic side view, with parts in section and parts removed for clarity, of an overwrapping machine implementing the method according to the present invention; FIGS. 1A and 1B are enlarged details in FIG. 1;
FIG. 2 shows a schematic side view, with parts in section and parts removed for clarity, of a variation of the FIG. 1 machine.
In actual use, a sheet 5 and a respective product 2 are fed in time with each other up to opening 7 by line 12 and device 10 respectively. As of this position, when product 2 is moved in direction 11 by device 10, one end of product 2 contacts sheet 5, which, together with product 2, is inserted through opening 7 into channel 6 and, in contact with the periphery of rollers 8, is gradually folded into a U about product 2. Rollers 8 may be powered to rotate in opposite directions, and so that each roller 8 rotates, in contact with a respective portion of sheet 5, in the opposite direction to direction 11.
As the sheet is gradually folded into a U, product 2 and respective sheet 5 gradually enter the electric field generated by capacitor 18, and sheet 5 is positioned with a first portion 19 of its outer surface 20 facing and adjacent to plate 16, and with a second portion 21 of surface 20 facing and adjacent to plate 17. Said electric field induces, on portions 19 and 21, surface electric charges 22 opposite in sign to the electric charges distributed on respective adjacent plates 16 and 17. At the same time, the electric field induces, on portions 23 and 24 of an inner surface 25 of sheet 5, electric charges 26 opposite in sign to the electric charges 22 distributed on corresponding portions 19 and 21 of surface 20. And at the same time, the electric field induces, on portions 27 and 28 of an outer surface 29 of product 2, electric charges 30 opposite in sign to the electric charges 26 distributed on the corresponding portions 23 and 24 of surface 25.
Being opposite in sign and attracting each other, charges 26 and 30 provide for substantially vacuum connecting sheet 5 to product 2, for stabilizing sheet 5 in the U-folded position about product 2, and for ensuring sheet 5 adheres perfectly to product 2 for a certain length of time and in the absence of an electric field, with no need for any type of external retaining element.
In the FIG. 2 variation, the outer surface 31 of plate 16 facing plate 17 comprises a number of seats 32, each having a lining 33 of electrically insulating material, and each housing a respective pad 34 made of electrically conducting material and with its outer surface coplanar with surface 31. Plate 16 and pads 34 are respectively connected to the negative pole of a respective generator 15 and to the positive pole of generator 15, and define a first capacitor 35 for generating an electric field close to surface 31 of plate 16.
Similarly, the outer surface 36 of plate 17 facing plate 16 comprises a number of seats 37, each having a lining 38 of electrically insulating material, and each housing a respective pad 39 made of electrically conducting material and with its outer surface coplanar with surface 36. Plate 17 and pads 39 are respectively connected to the negative pole of a respective generator 15 and to the positive pole of generator 15, and define a second capacitor 40 for generating an electric field close to surface 36 of plate 17.
According to a variation not shown, plates 16 and 17 are dispensed with, and the poles of generator 15 are connected to rollers 8, which, in this case, are made of electrically conducting material.
According to a further variation not shown, plates 16 and 17 and generator 15 are dispensed with, and rollers 8 are drive rollers made at least externally of a material for generating electric charges 22 on sheet 5 by triboelectrification or frictional electricity.
In which case, said electric field is a local electric field generated by charges 22, and which induces, on surface 29 of product 2, charges 30 opposite in sign to charges 22.
Claims (10)
1. A method of wrapping a product (2) made at least externally of dielectric material, the method comprising the step of folding a sheet (5) of dielectric wrapping material into a U about said product (2), and being characterized by comprising a stabilizing step for stabilizing the sheet (5) in the U-folded position; said stabilizing step being performed by generating an electrostatic force of attraction between the sheet (5) and an outer surface (29) of the product (2).
2. A method as claimed in claim 1, characterized in that said force is generated by forming a first given distribution (26) of electric charges on said sheet (5), and a second distribution (30) of charges of opposite sign on the outer surface (29) of the product (2).
3. A method as claimed in claim 2, characterized in that said distributions (26, 30) of electric charges are formed by induction, by placing the product (2) and the sheet (5) inside an electric field; said first distribution (26) of charges being formed on an inner surface (25) of the sheet (5).
4. A method as claimed in claim 3, characterized in that said electric field is formed by means of two plates (16, 17) made of electrically conducting material and located on either side of a path (11) of the product (2); said plates (16, 17) forming the plates of a capacitor (18).
5. A method as claimed in claim 3, characterized in that said electric field is formed by means of two plates (16, 17) located on either side of a path (11) of the product (2); each said plate (16; 17) being made of electrically conducting material, and having at least one seat (32; 37) for housing a pad (34; 39) of electrically conducting material via the interposition of a layer (33; 38) of dielectric material; and said plate (16; 17) and the respective pad (34; 39) being connected to opposite poles of an electric generator (15) to define respective plates of a capacitor (35; 40).
6. A method as claimed in claim 2, characterized in that said first (26) and second (30) distributions of electric charges are formed by depositing charges on said sheet (5).
7. A method as claimed in claim 6, characterized in that said first distribution (26) of charges is formed on an outer surface (20) of said sheet (5).
8. A method as claimed in claim 1, characterized in that said sheet (5) of wrapping material is a sheet (5) of overwrapping material; said product (2) comprising an outer wrapping (3) of dielectric material.
9. A method as claimed in claim 1, characterized by comprising the steps of feeding said sheet (5) past an opening (7) of a passage (6) for said product (2); feeding the product (2) to be overwrapped into engagement with the sheet (5) and subsequently, together with the sheet (5), through said passage (6) to fold the sheet (5) into a U about the product (2); and stabilizing the sheet (5) so folded by feeding the sheet (5) and the product (2) through an electric field.
10. A method as claimed in claim 9, characterized in that the product (2) and the respective sheet (5) are fed through said electric field as they emerge from said passage (6).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT96BO000141A IT1285616B1 (en) | 1996-03-15 | 1996-03-15 | METHOD FOR WRAPPING A PRODUCT |
| ITB096A000141 | 1996-03-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US5884455A true US5884455A (en) | 1999-03-23 |
Family
ID=11341247
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US08/816,638 Expired - Fee Related US5884455A (en) | 1996-03-15 | 1997-03-13 | Product wrapping method |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US5884455A (en) |
| EP (1) | EP0795477B1 (en) |
| JP (1) | JPH1016911A (en) |
| CN (1) | CN1073525C (en) |
| DE (1) | DE69722487T2 (en) |
| IT (1) | IT1285616B1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040168402A1 (en) * | 2001-06-13 | 2004-09-02 | Guido Ribi | Processes for causing an extensible polymer film to adhere to the edge of the opening of a bottle or similar container made of plastic (pet or the like) or metal and various devices for implementing said processes |
| US20100326563A1 (en) * | 2009-06-30 | 2010-12-30 | Toshiya Kobayashi | Method of eliminating static charge from resin vessel, method of sterilizing and filling resin vessel, method of filling and capping resin vessel, apparatus for eliminating static charge from resin vessel, and resin vessel sterilizing and filling system |
| US20110210093A1 (en) * | 1997-01-27 | 2011-09-01 | Leon Antoine Ribi | Tape for Mass-Sealing Bottles and Similar Containers, and Apparati for Its Application and Removal |
| US20130276409A1 (en) * | 2012-04-23 | 2013-10-24 | Alain Cerf | Process and Apparatus for Increasing Stacking Strength of Film Wrapped Articles |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06147902A (en) * | 1992-11-04 | 1994-05-27 | Murata Mfg Co Ltd | Vibration gyro |
| JP4638758B2 (en) * | 2005-03-30 | 2011-02-23 | 三菱製紙株式会社 | Automatic flat packaging machine |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3784711A (en) * | 1971-09-02 | 1974-01-08 | Du Pont | Surface treated cheese package and method |
| US4182222A (en) * | 1978-02-16 | 1980-01-08 | Stahl Robert L | Coupon confining bag method |
| US4419855A (en) * | 1980-11-24 | 1983-12-13 | Shanklin Frank G | Low drag static seamer |
| US4782647A (en) * | 1987-10-08 | 1988-11-08 | Becton, Dickinson And Company | Flexible packaging and the method of production |
| US4945709A (en) * | 1989-03-17 | 1990-08-07 | Polycerf, Inc. | Device and method for applying a static seal |
| US5116444A (en) * | 1991-05-30 | 1992-05-26 | Sealed Air Corporation | Apparatus and method for enhancing lamination of plastic films |
| US5156712A (en) * | 1990-02-22 | 1992-10-20 | POST Ronald | Sealing system |
| US5199246A (en) * | 1992-09-08 | 1993-04-06 | Illinois Tool Works Inc. | Electrostatic method and apparatus for opening liners within containers |
-
1996
- 1996-03-15 IT IT96BO000141A patent/IT1285616B1/en active IP Right Grant
-
1997
- 1997-03-13 US US08/816,638 patent/US5884455A/en not_active Expired - Fee Related
- 1997-03-13 DE DE69722487T patent/DE69722487T2/en not_active Expired - Fee Related
- 1997-03-13 EP EP97104286A patent/EP0795477B1/en not_active Expired - Lifetime
- 1997-03-14 CN CN97109614A patent/CN1073525C/en not_active Expired - Fee Related
- 1997-03-17 JP JP9063586A patent/JPH1016911A/en not_active Ceased
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3784711A (en) * | 1971-09-02 | 1974-01-08 | Du Pont | Surface treated cheese package and method |
| US4182222A (en) * | 1978-02-16 | 1980-01-08 | Stahl Robert L | Coupon confining bag method |
| US4419855A (en) * | 1980-11-24 | 1983-12-13 | Shanklin Frank G | Low drag static seamer |
| US4782647A (en) * | 1987-10-08 | 1988-11-08 | Becton, Dickinson And Company | Flexible packaging and the method of production |
| US4945709A (en) * | 1989-03-17 | 1990-08-07 | Polycerf, Inc. | Device and method for applying a static seal |
| US5156712A (en) * | 1990-02-22 | 1992-10-20 | POST Ronald | Sealing system |
| US5116444A (en) * | 1991-05-30 | 1992-05-26 | Sealed Air Corporation | Apparatus and method for enhancing lamination of plastic films |
| US5199246A (en) * | 1992-09-08 | 1993-04-06 | Illinois Tool Works Inc. | Electrostatic method and apparatus for opening liners within containers |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110210093A1 (en) * | 1997-01-27 | 2011-09-01 | Leon Antoine Ribi | Tape for Mass-Sealing Bottles and Similar Containers, and Apparati for Its Application and Removal |
| US8616258B2 (en) | 1997-01-27 | 2013-12-31 | Ribi Pack S.P.A. | Tape for mass-sealing bottles and similar containers, and apparati for its application and removal |
| US20040168402A1 (en) * | 2001-06-13 | 2004-09-02 | Guido Ribi | Processes for causing an extensible polymer film to adhere to the edge of the opening of a bottle or similar container made of plastic (pet or the like) or metal and various devices for implementing said processes |
| US7222470B2 (en) * | 2001-06-13 | 2007-05-29 | Ribi Pack S.P.A. | Processes for causing an extensible polymer film to adhere to the edge of the opening of a bottle or similar container made of plastic (pet or the like) or metal and various devices for implementing said processes |
| US20100326563A1 (en) * | 2009-06-30 | 2010-12-30 | Toshiya Kobayashi | Method of eliminating static charge from resin vessel, method of sterilizing and filling resin vessel, method of filling and capping resin vessel, apparatus for eliminating static charge from resin vessel, and resin vessel sterilizing and filling system |
| US8505269B2 (en) * | 2009-06-30 | 2013-08-13 | Shibuya Kogyo Co., Ltd. | Method, apparatus and system of eliminating static charge and filling and sterilizing resin vessel |
| US20130276409A1 (en) * | 2012-04-23 | 2013-10-24 | Alain Cerf | Process and Apparatus for Increasing Stacking Strength of Film Wrapped Articles |
| US9003747B2 (en) * | 2012-04-23 | 2015-04-14 | Alain Cerf | Process and apparatus for increasing stacking strength of film wrapped articles |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0795477A1 (en) | 1997-09-17 |
| CN1164497A (en) | 1997-11-12 |
| DE69722487T2 (en) | 2004-05-06 |
| IT1285616B1 (en) | 1998-06-18 |
| DE69722487D1 (en) | 2003-07-10 |
| CN1073525C (en) | 2001-10-24 |
| EP0795477B1 (en) | 2003-06-04 |
| JPH1016911A (en) | 1998-01-20 |
| ITBO960141A0 (en) | 1996-03-11 |
| ITBO960141A1 (en) | 1997-09-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AS | Assignment |
Owner name: G.D SOCIETA' PER AZIONI, ITALY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:DRAGHETTI, FIORENZO;CESARI, MINO;TURRA, MARIO;REEL/FRAME:008746/0144 Effective date: 19970507 |
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| FPAY | Fee payment |
Year of fee payment: 4 |
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| REMI | Maintenance fee reminder mailed | ||
| FPAY | Fee payment |
Year of fee payment: 8 |
|
| REMI | Maintenance fee reminder mailed | ||
| LAPS | Lapse for failure to pay maintenance fees | ||
| STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
|
| FP | Lapsed due to failure to pay maintenance fee |
Effective date: 20110323 |